the tsa also stuffing up passenger screenings. meanwhile, event organizers began revisiting security plans for big upcoming gatherings. the oklahoma city marathon, a bike race in houston, a 10k in miami, nascar in virginia, even the kentucky derby and indy 500 getting a second look. >> i think the event in boston yesterday will raise once again the consciousness that there is a reason, there is a need for the extra security that they encounter. >> reporter: since 9/11, there's been a dramatic increase in the use of security cameras. today an influential republican called for even more. >> out on the street, there's not an expectation of privacy. >> reporter: at the lapd intelligence nerve center, the police chief insisted his cameras and officers can't do it alone. >> there is no way that 10,000 los angeles police officers can watch over a city of 4 million people. without the help of the people that they're watching. >> reporter: the message since 9/11, if you see something, say something. police and security experts are reiterat